AC

AC, A.C. or Ac may refer to:

Air conditioning, technologies for altering the temperature and humidity of air
Alternating current, a type of electrical current in which the current repeatedly changes direction

Arts and entertainment

Ace Combat, a series of combat flight simulator games
Armor Class, a combat-related parameter in the Dungeons & Dragons role playing game system
Asheron's Call, a fantasy massively multiplayer online role-playing game
Assassin's Creed, a series of action-adventure games
Assetto Corsa, a racing simulator game
Animal Crossing, a series of community simulation games
A.C., a character in Fortnite: Save the World

AC Comics, a comic book publisher established in 1969
A.C. Slater, a fictional character in the American sitcom Saved by the Bell
After Colony, an alternate timeline in the Gundam metaseries for the universe of Gundam Wing
AC, the name of the "ultimate computer" in Isaac Asimov's novel The Last Question
Alien: Covenant, a 2017 science-fiction horror film by Ridley Scott.

AC Cars, a British specialist automobile manufacturer
AC Spark Plug, Delco, AC-Delco, and ACDelco, automotive parts brands owned by General Motors
AC Restaurants, a hotel and restaurant chain in the Benelux
Air Canada, the flag carrier and largest airline of Canada (IATA code AC)
Allis-Chalmers, a former industrial conglomerate
Associated Content, an online publisher and distributor of original content
Ayala Corporation, a holding company (Philippine Stock Exchange symbol AC)

Action Congress, a political party in Nigeria
Alternative for Change (Alternativa por el Cambio), a political party in Nicaragua
Coast Alliance (Alianza Costeña), a former regional political coalition in Nicaragua

AC – The Danish Confederation of Professional Associations, an umbrella organisation for several Danish trade unions
AC Transit, a regional public transit agency in the San Francisco Bay Area
Ad Council Japan (AC Japan), an organization that distributes Japanese public service announcements
Athletics Canada, the governing body of athletics in Canada
Civic Alliance Foundation (Alianţa Civică), a Romanian non-governmental organization

Aelod y Cynulliad, title for Members of the National Assembly for Wales
Aircraftman, an air forces rank
Ashoka Chakra (military decoration), India's highest peacetime military decoration
Assistant Commissioner of Police of the Metropolis, a rank in London's Metropolitan Police
Companion of the Order of Australia
First assistant camera or Second assistant camera, in film-making

Acromioclavicular joint (AC joint), the shoulder junction between the scapula and the clavicle
Adenylate cyclase, a lyase enzyme
Adriamycin and cyclophosphamide, a chemotherapy regimen used to treat breast cancer
Ante cibum (ac), Latin for "before meal", commonly seen in medical prescriptions
Anterior commissure, a bundle of nerve fibers connecting the two temporal lobes of the brain
Anterior cruciate ligament (AC ligament or ACL), a major ligament in the knee
Appropriateness criteria, when it is appropriate to perform a medical procedure or service
Assist control, a former term for continuous mandatory ventilation, a mode of mechanical ventilation

.ac, Internet top-level domain name for Ascension Island
.ac (second-level domain), Internet second-level domain used to denote academic institutions in many countries
AC (complexity), a hierarchy of complexity classes found in circuit complexity
AC, initialism of access control
Artificial consciousness, a field related to artificial intelligence and cognitive robotics
Authorization certificate or attribute certificate, a digital permission to use a service or resource
802.11ac, a wifi standard using 5GHz, released in Dec 2013

Altocumulus, a medium level cloud type
Anticipated convection, convective outlooks issued by the U.S. National Weather Service

Air conditioning, technologies for altering the temperature and humidity of air
Across corners (A/C), a measure of external diameter of hexagonal nuts
Alternating current, a type of electric current
- AC power, a net transfer of energy over a complete cycle of the alternating current waveform
Asphalt concrete, a type of road or path surfacing
Average cost, in economics
Axiom of choice, a mathematical concept in set theory

Ac (rune) (ᚪ), a rune of the Anglo-Saxon fuþorc and a continuation of the Elder Fuþark ansuz
Acre, a unit of area with the symbol ac
Advisory circular, a publication to provide guidance for compliance with airworthiness regulations
Ante Christum or A.C., a Latin term meaning "before Christ"
Anthrocon, the largest furry convention in the world, held in Pittsburgh, Pennsylvania, US

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